<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script src="js/vue.js" type="text/javascript">
			
		</script>
		<style type="text/css">
			table{
				border: 1px solid #e9e9e9;
				border-collapse: collapse;
				border-spacing: 0;
			}
			th,td{
				padding: 8px 16px;
				border: 1px solid #e9e9e9;
				text-align: left;
			}
			th{
				background-color: #f7f7f7;
				color: #5c6b77;
				font-weight: 600;
			}
			td button{
				margin: 0 4px;
			}
		</style>
	</head>
	<body>
		<div id="app">
			<div v-if="books.length">
				<table border="" cellspacing="" cellpadding="">
					<thead>
						<tr>
							<th></th>
							<th>书籍名称</th>
							<th>出版日期</th>
							<th>价格</th>
							<th>购买数量</th>
							<th>操作</th>
						</tr>
					</thead>
					<tbody>
						<tr v-for="(items,index) in books">
							<td>{{items.id}}</td>
							<td>{{items.name}}</td>
							<td>{{items.date}}</td>
							<td>{{items.price | showPrice}}</td>
							<td><button @click="decrement(items)" :disabled="items.count<=1">-</button>{{items.count}}<button @click="increment(items)">+</button></td>
							<td><button @click="remove(index)">移除</button></td>
						</tr>
					</tbody>
				</table>
				<h1>总价格：{{totalPrice|showPrice}}</h1>
			</div>
			<h2 v-else>购物车为空！</h2>
		</div>
	</body>
	<script type="text/javascript">
		var app = new Vue({
			el:"#app",
			data:{
				books:[
					{
						id:1,
						name:"《算法导论》",
						date:"2006-9",
						price: 95,
						count: 1,
					},
					{
						id:2,
						name:"《UNIX编程艺术》",
						date:"2006-9",
						price: 100,
						count: 1,
					},
					{
						id:3,
						name:"《编程筑基》",
						date:"2006-9",
						price: 100,
						count: 1,
					},
					{
						id:4,
						name:"《计算机原理》",
						date:"2006-9",
						price: 100,
						count: 1,
					},
				],
			},
			methods:{
				decrement(item){
					item.count--;
				},
				increment(item){
					item.count++;
				},
				remove(index){
					this.books.splice(index,1);
				}
			},
			filters:{
				showPrice(price){
					return '￥'+price.toFixed(2);
				}
			},
			computed:{
				totalPrice(){
					let totalPrice = 0;
					for(let i = 0;i<this.books.length;i++)
					{
						totalPrice+=this.books[i].price*this.books[i].count;
					}
					return totalPrice;
				}
			},
		})
	</script>
</html>
